Breathing is essential to life. And lately, the safety of the air we inhale, or the need to pause and take a deep breath, is on our minds a lot. This hour, TED speakers explore the power of breath. Guests include former world champion freediver Tanya Streeter, journalist Beth Gardiner, activist Yvette Arellano, paleontologist Emma Schachner, scent historian Caro Verbeek, and mindfulness expert Andy Puddicombe.